I've had a Badass on my Jazz Bass since the early '80s. I still love it, even thought the design is near archaic.

You can go either way, file the notch yourself, or let the string do it over time. Eventually you have a notch, if you leave it up to the strung. However, in the meantime, you might a have a G string that moves around a small bit.

I seem to recall leaving it alone for awhile, but filing a notch at least for the G.

yep- I strung my Warmoth P through the body using a BadassII - i drilled holes through the baseplate in line with the mounting screws.

I had to file the saddles in places so the strings had a clearer path over them into the holes, but no problems with string breakage or buzzes.

re. Gotoh 201 - I've put one on my Yamaha RBX270F.
it's about 2/3rds the weight of a BaddassII (it's not completely solid- on the underside you can see the tailpiece is hollow at points, also the baseplate is smaller, so you don't get quite as much sustain and clarity as a Baddass).